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Oct 25, 2014
10/14

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Haddad, Mohanna Y.; El-Najjar, Mahmoud Y.

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This article is from Journal of Family & Community Medicine , volume 5 . Abstract Background:: Hereditary diseases form an omnibus problem in Arab societies in general and in rural Arab societies in particular. Aim:: Study of hereditary blindness and its relation to endogamous marriage among the Gharaghir tribe in the Jordan valley. Methodology:: The researchers carried out a fieldwork among the Gharaghir tribe in Al-Sawalha (the northern valley region, Deir Alla, the Hashemite Kingdom of...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3437087

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Oct 25, 2014
10/14

by
Jarallah, Jamal S.

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This article is from Journal of Family & Community Medicine , volume 5 . Abstract Background:: Referral between primary care and hospitals is of great importance for patient care and follow-up. This study was conducted because of the importance of the quality of referral letters and feedback reports. Objectives:: To evaluate the quality of referrals from primary health care (PHC) centers to general hospital in four regions in Saudi Arabia. Methods:: This was a cross-sectional study of a...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3437083

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Oct 28, 2014
10/14

by
Bayat, Mahomed; Pillay, Basil J.; Cassimjee, Mohammed H.

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This article is from Journal of Family & Community Medicine , volume 5 . Abstract Objective:: The aim of the study was to assess the knowledge, attitude and practice of cigarette smoking behavior (CSB) in a sample of Indian matriculation students. Methodology:: All (N=325) Indian matriculation students, at high schools, in Northern Kwa-Zulu Natal, South Africa, were included in the study. A questionnaire was administered to assess knowledge, attitudes and practice of CSB. Results and...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3437120

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Oct 27, 2014
10/14

by
Alhamad, Abdulrazzak; Al-Faris, Eiad A.

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This article is from Journal of Family & Community Medicine , volume 5 . Abstract Objective:: The objective of this study was to validate an Arabic version of the General Health Questionnaire (GHQ-28) in a primary care setting in Saudi Arabia. Methodology:: A total of 60 Saudi patients selected by means of systematic random sampling were asked to fill out the GHQ-28 Arabic version. The psychiatrist interviewed all patients using the Arabic version of the Clinical Interview Schedule (CIS)....

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3437115

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Oct 29, 2014
10/14

by
Al-Mejhim, Fathiya M.; Al-Najashi, Sulaiman S.

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This article is from Journal of Family & Community Medicine , volume 5 . Abstract Objective:: The aim of the study is to identify the major causes of perinatal mortality and to determine the main maternal factors which affect perinatal mortality at the King Fahd Hospital of the University (KFHU), Al-Khobar, Saudi Arabia. Methods:: A retrospective study was conducted covering a period of ten years from January 1987 to December 1996. All 548 perinatal deaths, which occurred during that...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3437085

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Oct 29, 2014
10/14

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Ghazali, Buthaina M.; Al-Wabel, Huda M.; Farghaly, Nadia F.; Samy, Maisa A.

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This article is from Journal of Family & Community Medicine , volume 5 . Abstract Introduction:: There is a reliable evidence that personnel working in a variety of settings beyond mainstream mental health services can make an important contribution to the prevention of mental health problems. Aim:: To assess the ability of personnel in different sectors including schools, school health unit and Primary Health Care (PHC) centers to recognize the risks and signs of deteriorating mental...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3437116

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Sep 18, 2013
09/13

by
G. Gervino; G. Kaniadakis; A. Lavagno; M. Lissia; P. Quarati

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The solar core, because of its density and temperature, is not a weakly-interacting or a high-temperature plasma. Collective effects have time scales comparable to the average time between collisions, and the microfield distribution influences the particle dynamics. In this conditions ion and electron diffusion is a non-Markovian process, memory effects are present and the equilibrium statistical distribution function differs from the Maxwellian one. We show that, even if the deviations from...

Source: http://arxiv.org/abs/physics/9809001v1

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Sep 18, 2013
09/13

by
R. A. Janik; M. A. Nowak; G. Papp; I. Zahed pages; :; 4

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Using the Gell-Mann-Oakes-Renner (GOR) relation and semi-classical arguments, we show that the bulk quark spectrum in QCD exhibits a variety of regimes including the ergodic one described by random matrix theory. We analyze the quark spectral form-factor in the diffusive and ballistic regime. We suggest that a class of chiral transitions in QCD is possibly of the metal-insulator type, with a universal spectral statistics at the mobility edge.

Source: http://arxiv.org/abs/hep-ph/9803289v1

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Sep 22, 2013
09/13

by
B. G. Elmegreen; D. M. Elmegreen; E. Brinks; C. Yuan; M. Kaufman; M. Klaric; L. Montenegro; C. Struck; M. Thomasson

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Observations with the Hubble Space Telescope reveal an irregular network of dust spiral arms in the nuclear region of the interacting disk galaxy NGC 2207. The spirals extend from ~50 pc to ~300 pc in galactocentric radius, with a projected width of ~20 pc. Radiative transfer calculations determine the gas properties of the spirals and the inner disk, and imply a factor of ~4 local gas compression in the spirals. The gas is not strongly self-gravitating, nor is there a nuclear bar, so the...

Source: http://arxiv.org/abs/astro-ph/9807037v1

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Sep 20, 2013
09/13

by
Jian Wang; Hong Guo

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We have calculated and statistically analyzed the magnetic-field spectrum (the ``B-spectrum'') at fixed electron Fermi energy for two quantum dot systems with classically chaotic shape. This is a new problem which arises naturally in transport measurements where the incoming electron has a fixed energy while one tunes the magnetic field to obtain resonance conductance patterns. The ``B-spectrum'', defined as the collection of values ${B_i}$ at which conductance $g(B_i)$ takes extremal values,...

Source: http://arxiv.org/abs/cond-mat/9810110v1

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Sep 19, 2013
09/13

by
Marek Czachor

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Cryptographic scheme proposed by Bennett, Brassard, and Mermin [Phys. Rev. Lett. {\bf 68}, 557 (1992)] is reformulated in a version involving two polarizing Mach-Zehnder interferometers. Such a form, although physically equivalent to the original one, makes its security explicit, suggestive and easy to explain to non-experts.

Source: http://arxiv.org/abs/quant-ph/9812030v1

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Sep 19, 2013
09/13

by
Marcella Contini; Liliana Formiggini

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We investigate the evolution of RR Tel after the outburst by fitting the emission spectra in two epochs. The first one (1978) is characterized by large fluctuations in the light curve and the second one (1993) by the slow fading trend. In the frame of a colliding wind model two shocks are present: the reverse shock propagates in the direction of the white dwarf and the other one expands towards or beyond the giant. The results of our modeling show that in 1993 the expanding shock has overcome...

Source: http://arxiv.org/abs/astro-ph/9812471v1

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Sep 18, 2013
09/13

by
Ehud Cohen; Tsvi Piran; Re'em Sari

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We derive a self similar solution for the propagation of an extreme relativistic (or Newtonian) radiative spherical blast wave into a surrounding cold medium. The solution is obtained under the assumption that the radiation process is fast, it takes place only in the vicinity of the shock and that it radiates away a fixed fraction of the energy generated by the shock. In the Newtonian regime these solutions generalize the Sedov-Taylor adiabatic solution and the pressure-driven fully radiative...

Source: http://arxiv.org/abs/astro-ph/9803258v1

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Jul 20, 2013
07/13

by
Christopher Mudry; B. D. Simons; Alexander Altland

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We study the influence of a strong imaginary vector potential on the quantum mechanics of particles confined to a two-dimensional plane and propagating in a random impurity potential. We show that the wavefunctions of the non-Hermitian operator can be obtained as the solution to a two-dimensional Dirac equation in the presence of a random gauge field. Consequences for the localization properties and the critical nature of the states are discussed.

Source: http://arxiv.org/abs/cond-mat/9712103v2

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Sep 20, 2013
09/13

by
R. Myrzakulov

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The briefly review on the common spin description of the nonlinear evolution equations.

Source: http://arxiv.org/abs/solv-int/9802017v1

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Sep 23, 2013
09/13

by
Loran Ts. Adzhemyan; Nikolaj V. Antonov

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Field theoretical renormalization group methods are applied to a simple model of a passive scalar quantity advected by the Gaussian non-solenoidal (``compressible'') velocity field with the covariance $\propto\delta(t-t')| x-x'|^{\epsilon}$. Convective range anomalous scaling for the structure functions and various pair correlators is established, and the corresponding anomalous exponents are calculated to the order $\epsilon^2$ of the $\epsilon$ expansion. These exponents are non-universal, as...

Source: http://arxiv.org/abs/chao-dyn/9806004v2

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Sep 22, 2013
09/13

by
Jianjun Xie; Stefano de Gironcoli; Stefano Baroni; Matthias Scheffler

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The temperature dependent surface relaxation of Ag(111) is calculated by density-functional theory. At a given temperature, the equilibrium geometry is determined by minimizing the Helmholtz free energy within the quasiharmonic approximation. To this end, phonon dispersions all over the Brillouin zone are determined from density-functional perturbation theory. We find that the top-layer relaxation of Ag(111) changes from an inward contraction (-0.8 %) to an outward expansion (+6.3%) as the...

Source: http://arxiv.org/abs/cond-mat/9807198v1

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Sep 23, 2013
09/13

by
Chandrashekar Devchand; Jean Nuyts

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Lorentz covariant generalisations of the notions of supersymmetry, superspace and self-duality are discussed. The essential idea is to extend standard constructions by allowing tangent vectors and coordinates which transform according to more general Lorentz representations than solely the spinorial and vectorial ones of standard lore. Such superspaces provide model configuration spaces for theories of arbitrary spin fields. Our framework is an elegant one for handling higher-dimensional...

Source: http://arxiv.org/abs/hep-th/9806243v1

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Sep 19, 2013
09/13

by
Ilka Brunner; Andreas Karch

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We review the construction of six dimensional N=1 fixed points in a brane picture involving D6 branes stretching between NS 5 branes.

Source: http://arxiv.org/abs/hep-th/9801156v1

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Sep 22, 2013
09/13

by
E. Oset; A. Ramos

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We review recent developments concerning the weak decay of Lambda hypernuclei. New studies covering the mesonic decay channel as well as recent models for the non-mesonic one are discussed and compared with experimental data. The puzzle of the neutron- to proton-induced decay ratio, Gamma_n/Gamma_p, is addressed in connection to the two-nucleon induced decay channel and proposals for more efficient experimental analyses of this ratio are made.

Source: http://arxiv.org/abs/nucl-th/9807018v1

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Sep 19, 2013
09/13

by
A. Zabrodin

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We give two "complementary" descriptions of the curve $\Gamma$ parametrizing double-Bloch solutions to the difference analogue of the Lam\'e equation. The curve depends on a positive integer number $\ell$ and two continuous parameters: the "lattice spacing" $\eta$ and the modular parameter $\tau$. Apart from being a covering of the elliptic curve with the modular parameter $\tau$, $\Gamma$ is a hyperelliptic curve of genus $2\ell$. We also point out connections between the...

Source: http://arxiv.org/abs/math/9812161v1

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Sep 19, 2013
09/13

by
Michael Pascaud; Gilles Montambaux

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We describe the effects of phase coherence on transport and thermodynamic properties of a disordered conducting network. In analogy with weak-localization correction, we calculate the phase coherence contribution to the magnetic response of mesoscopic metallic isolated networks. It is related to the return probability for a diffusive particle on the corresponding network. By solving the diffusion equation on various types of networks, including a ring with arms, an infinite square network or a...

Source: http://arxiv.org/abs/cond-mat/9801236v1

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Sep 22, 2013
09/13

by
C. B. Yang; X. Cai

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Multiplicity distribution in small bins is studied within the Ginzburg-Landau description for first-order quark-hadron phase transition. Direct comparison of the distribution with a Poisson one (with the same average) is made. Dynamical factor $d_q$ for the distributionand ratio $D_q\equiv d_q/d_1$ are studied, and novel scaling behaviors between $D_q$ are found which can be used to detect the formation of quark-gluon plasma.

Source: http://arxiv.org/abs/hep-ph/9805213v1

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Sep 19, 2013
09/13

by
Jens Eggers; Hermann Riecke

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The motion of a thin layer of granular material on a plate undergoing sinusoidal vibrations is considered. We develop equations of motion for the local thickness and the horizontal velocity of the layer. The driving comes from the violent impact of the grains on the plate. A linear stability theory reveals that the waves are excited non-resonantly, in contrast to the usual Faraday waves in liquids. Together with the experimentally observed continuum scaling, the model suggests a close...

Source: http://arxiv.org/abs/patt-sol/9801004v3

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Sep 19, 2013
09/13

by
J. Blümlein; V. Ravindran; W. L. van Neerven

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The status of various relations among higher order QCD corrections is discussed. In particular, Drell-Levy-Yan relation and Supersymmetric relation are studied at the two-loop level. We have also investigated the validity of such relations for physical observables.

Source: http://arxiv.org/abs/hep-ph/9812450v1

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Sep 18, 2013
09/13

by
Luis Santos; Luis Roso

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We show that under certain circumstances an atom can follow an oscillatory motion in a periodic laser profile with a Gaussian envelope. These oscillations can be well explained by using a model of energetically forbidden spatial regions. The similarities and differences with Bloch oscillations are discussed. We demonstrate that the effect exists not only for repulsive but also for attractive potentials, i.e. quantum multiple reflections are also possible.

Source: http://arxiv.org/abs/quant-ph/9811033v1

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Sep 19, 2013
09/13

by
A. Isacsson; L. Y. Gorelik; M. V. Voinova; B. Kasemo; R. I. Shekhter; M. Jonson

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We study a simple model of a self-assembled, room temperature Coulomb-blockade nanostructure containing a metallic nanocrystal or grain connected by soft molecular links to two metallic electrodes. Self-excitation of periodic grain vibrations at 10 - 100 GHz is shown to be possible for a sufficiently large bias voltage leading to a novel `shuttle mechanism' of discrete charge transfer and a current through the nanostructure proportional to the vibration frequency. For the case of weak...

Source: http://arxiv.org/abs/cond-mat/9804281v2

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Sep 19, 2013
09/13

by
Chang-Yeong Lee

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Using the formalism of noncommutative geometric gauge theory based on the superconnection concept, we construct a new type of vector gauge theory possessing a shift-like symmetry and the usual gauge symmetry. The new shift-like symmetry is due to the matrix derivative of the noncommutative geometric gauge theory, and this gives rise to a mass term for the vector field without introducing the Higgs field. This construction becomes possible by using a constant one form even matrix for the matrix...

Source: http://arxiv.org/abs/hep-th/9709040v2

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Sep 23, 2013
09/13

by
M. E. Gaevski; A. V. Bobyl; D. V. Shantsev; Y. M. Galperin; V. V. Tret'yakov; T. H. Johansen; R. A. Suris

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Spatially-resolved studies of a YBaCuO thin film bridge using electron probe microanalysis (EPMA), low-temperature scanning electron microscopy (LTSEM), and magneto-optical flux visualization (MO) have been carried out. Variations in chemical composition along the bridge were measured by EPMA with 3 microns resolution. Using LTSEM the spatial distributions of the critical temperature, Tc, and of the local transition width, dTc, were determined with 5 microns resolution. Distributions of...

Source: http://arxiv.org/abs/cond-mat/9806052v3

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Sep 18, 2013
09/13

by
Harvey R. Brown; Erik Sjoeqvist; Guido Bacciagaluppi

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It is argued that the topological approach to the (anti-)symmetrisation condition for the quantum state of a collection of identical particles, defined in the `reduced' configuration space, is particularly natural from the perspective of de Broglie-Bohm pilot-wave theory.

Source: http://arxiv.org/abs/quant-ph/9811054v1

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Sep 22, 2013
09/13

by
Andrew Billyard; Alan A Coley; Jesus Ibanez

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We study the qualitative properties of cosmological models in scalar-tensor theories of gravity by exploiting the formal equivalence of these theories with general relativity minimally coupled to a scalar field under a conformal transformation and field redefinition. In particular, we investigate the asymptotic behaviour of spatially homogeneous cosmological models in a class of scalar-tensor theories which are conformally equivalent to general relativistic Bianchi cosmologies with a scalar...

Source: http://arxiv.org/abs/gr-qc/9807055v1

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Sep 22, 2013
09/13

by
Oscar Arratia; Miguel A. Martin; Mariano A. Olmo

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We review several procedures of quantization formulated in the framework of (classical) phase space M. These quantization methods consider Quantum Mechanics as a "deformation" of Classical Mechanics by means of the "transformation" of the commutative algebra of smooth functions on M in a new non-commutative algebra. These ideas lead in a natural way to Quantum Groups as deformation (or quantization, in a broad sense) of Poisson-Lie groups, which is also analysed here.

Source: http://arxiv.org/abs/math-ph/9805016v1

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Sep 22, 2013
09/13

by
M. L. Chiofalo; A. Minguzzi; M. P. Tosi

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The dynamics of a confined fluid of Bose atoms is treated within the linear response regime, with a view to establishing a current-density functional formalism for an inhomogeneous superfluid state. After evaluating in full detail a simplified case of an external coupling to the density and phase of the condensate, the theory is extended to include the coupling to the total current density. The Kohn-Sham response functions of the condensate and all the exchange-correlation kernels for the...

Source: http://arxiv.org/abs/cond-mat/9807064v1

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Sep 18, 2013
09/13

by
Taro Nakano; Junichiro Makino

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We investigated the dynamical reaction of the central region of galaxies to a falling massive black hole by N-body simulations. As the initial galaxy model, we used an isothermal King model and placed a massive black hole at around the half-mass radius of the galaxy. We found that the central core of the galaxy is destroyed by the heating due to the black hole and that a very weak density cusp ($\rho \propto r^{-\alpha}$, with $\alpha \sim 0.5$) is formed around the black hole. This result is...

Source: http://arxiv.org/abs/astro-ph/9710135v2

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Sep 18, 2013
09/13

by
H. Kleinert; A. Chervyakov

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Quadratic fluctuations require an evaluation of ratios of functional determinants of second-order differential operators. We relate these ratios to the Green functions of the operators for Dirichlet, periodic and antiperiodic boundary conditions on a line segment. This permits us to take advantage of Wronski's construction method for Green functions without knowledge of eigenvalues. Our final formula expresses the ratios of functional determinants in terms of an ordinary $2\times2$ -determinant...

Source: http://arxiv.org/abs/quant-ph/9803016v2

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Sep 19, 2013
09/13

by
Zh. S. Gevorkian; Th. M. Nieuwenhuizen

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The contribution of interference effects to the radiation of a charged particle moving in a medium of randomly spaced plates is considered. In the angular dependent radiation intensity a peak appears at angles $\theta\sim\pi-\gamma^{-1}$, where $\gamma$ is the Lorentz factor of the charged particle.

Source: http://arxiv.org/abs/cond-mat/9801255v1

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Sep 18, 2013
09/13

by
M. Pernici; M. Raciti; F. Riva

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The Wilsonian exact renormalization group gives a natural framework in which ultraviolet and infrared divergences can be treated separately. In massless QED we introduce, as the only mass parameter, a renormalization scale $\L_R > 0$. We prove, using the flow equation technique, that infrared convergence is a necessary consequence of any zero-momentum renormalization condition at $\L_R$ compatible with the effective Ward identities and axial symmetry. The same formalism is applied to...

Source: http://arxiv.org/abs/hep-th/9710145v2

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Sep 20, 2013
09/13

by
K. Nakayama; A. Szczurek; C. Hanhart; J. Haidenbauer; J. Speth

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The production of $\omega$-mesons in proton-proton collisions for proton incident energies up to 2.2 GeV is investigated within a meson-exchange model of hadronic interactions. We find a large cancellation between the dominant $\pi\rho\omega$ meson-exchange current and nucleonic current contributions. A comparison with preliminary data from SATURNE calls for the inclusion of off-shell form factors at the $NN\omega$ and $\pi\rho\omega$ production vertices. Due to the present lack of knowledge of...

Source: http://arxiv.org/abs/nucl-th/9802013v1

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Sep 20, 2013
09/13

by
G. E. A. Matsas; J. C. Montero; V. Pleitez; D. A. T. Vanzella

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We argue in favor of the existence of the LIPs, the least interacting particles, which would only interact with ordinary matter through gravitational field and could account for (at least) part of the dark matter. The detectability of LIP matter is addressed at the end.

Source: http://arxiv.org/abs/hep-ph/9810456v1

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Sep 20, 2013
09/13

by
G. Tormen

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We study the merging history of dark matter haloes that end up in rich clusters, using N-body simulations of a scale-free universe. We compare the predictions of the extended Press & Schechter (PS) formalism (Bond et al. 1991; Bower 1991; Lacey & Cole 1993) with several conditional statistics of the proto-cluster matter: the mass distribution and relative abundance of progenitor haloes at different redshifts, the infall rate of progenitors within the proto-cluster, the formation...

Source: http://arxiv.org/abs/astro-ph/9802290v1

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Sep 23, 2013
09/13

by
Igor Batalin; Robert Marnelius

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A new type of quantum master equation is presented which is expressed in terms of a recently introduced quantum antibracket. The equation involves only two operators: an extended nilpotent BFV-BRST charge and an extended ghost charge. It is proposed to determine the generalized quantum Maurer-Cartan equations for arbitrary open groups. These groups are the integration of constraints in arbitrary involutions. The only condition for this is that the constraint operators may be embedded in an odd...

Source: http://arxiv.org/abs/hep-th/9806114v4

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Sep 20, 2013
09/13

by
P. Senger; H. Stroebele

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Data on hadronic particle production in symmetric nuclear collisions from SIS/BEVALAC to SPS energies are reviewed. The main emphasis is put on the production of pions, kaons, and antibaryons. Global features will be discussed in terms of rapidity and transverse momentum distributions and the total energy stored in produced particles. Pion and kaon production probabilities are studied as function of beam energy and their distribution in polar and azimuthal angle. Special emphasis is put on...

Source: http://arxiv.org/abs/nucl-ex/9810007v1

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Sep 23, 2013
09/13

by
Judith Mueller; Martin Grant

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We propose a model based on a Ginzburg-Landau approach to study a strain relief mechanism at a free interface of a non-hydrostatically stressed solid, commonly observed in thin-film growth. The evolving instability, known as the Grinfeld instability, is studied numerically in two and three dimensions. Inherent in the description is the proper treatment of nonlinearities. We find these nonlinearities can lead to competitive coarsening of interfacial structures, corresponding to different...

Source: http://arxiv.org/abs/cond-mat/9806278v1

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Sep 20, 2013
09/13

by
Seung-Kook Kim; Yong-Wan Kim; Young-Jai Park

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We show how to systematically derive the complete set of the gauge transformations of different types of the gauge invariant models, which are the chiral Schwinger and CP$^1$ with Chern-Simons term, in the Lagrangian Formalism.

Source: http://arxiv.org/abs/hep-th/9810016v1

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Sep 18, 2013
09/13

by
Yoshiaki Taniguchi; Youichi Ohyama

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Recently Taniguchi and Ohyama found that the higher $^{12}$CO to $^{13}$CO integrated intensity ratios at a transition $J$=1--0, $R = I(^{12}$CO)$/I(^{13}$CO) $\gtrsim 20$, in a sample of starburst merging galaxies such as Arp 220 are mainly attributed to the depression of $^{13}$CO emission with respect to $^{12}$CO. Investigating the same sample of galaxies analyzed by Taniguchi & Ohyama, we find that there is a tight, almost linear correlation between the dust mass and $^{13}$CO...

Source: http://arxiv.org/abs/astro-ph/9809344v1

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Sep 18, 2013
09/13

by
N. Pietralla; P. von Brentano; T. Otsuka; R. F. Casten

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The wavefunctions of the lowest odd spin positive parity yrast states in the IBA are shown to be nearly pure multiple quadrupole-phonon excitations even outside the three dynamical symmetries. The empirical data for collective nuclei with 30 < Z < 80 confirm these predictions. The quadrupole-phonon purity of the 2^+_1 state can be measured from E2-branching ratios of the 3^+_1 state. These data show a high correlation to the 2^+_1 Q-phonon purity deduced from the E2-decay of 2^+ states.

Source: http://arxiv.org/abs/nucl-ex/9803013v1

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Sep 22, 2013
09/13

by
Charles Buhler; Adriana Moreo

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As additional neutron scattering experiments are performed on a variety of high temperature superconducting compounds it appears that magnetic incommensuration is a phenomenon common to all of the samples studied. The newest experimental results indicate that incommensurate peaks exist at momentum ${\bf q}=\pi(1,1\pm\delta)$ and $\pi(1\pm\delta,1)$ in $La_{2-x}Sr_xCuO_4}$ (LSCO) and ${\rm YBa_2Cu_3O_{7-\delta}}$ (YBCO). The dependence of $\delta$ with hole doping appears to be similar in both...

Source: http://arxiv.org/abs/cond-mat/9807034v1

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Sep 21, 2013
09/13

by
Q. P. Liu; M. Manas

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We consider the vectorial approach to the binary Darboux transformations for the Kadomtsev-Petviashvili hierarchy in its Zakharov-Shabat formulation. We obtain explicit formulae for the Darboux transformed potentials in terms of Grammian type determinants. We also study the $n$-th Gel'fand-Dickey hierarchy introducing spectral operators and obtaining similar results. We reduce the above mentioned results to the Kadomtsev-Petviashvili I and II real forms, obtaining corresponding vectorial...

Source: http://arxiv.org/abs/solv-int/9705012v2

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Sep 18, 2013
09/13

by
H. Noh; S. Zelakiewicz; X. G. Feng; T. J. Gramila; L. N. Pfeiffer; K. W. West

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Electron drag measurements of electron-electron scattering rates performed close to the Fermi temperature are reported. While evidence of an enhancement due to plasmons, as was recently predicted [K. Flensberg and B. Y.-K. Hu, Phys. Rev. Lett. 73, 3572 (1994)], is found, important differences with the random-phase approximation based calculations are observed. Although static correlation effects likely account for part of this difference, it is argued that correlation-induced multiparticle...

Source: http://arxiv.org/abs/cond-mat/9809049v1

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23

Sep 19, 2013
09/13

by
Massimo Giovannini

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We present a class of exact cosmological solutions of the low energy string effective action in the presence of a homogeneous magnetic fields. We discuss the physical properties of the obtained (fully anisotropic) cosmologies paying particular attention to their vacuum limit and to the possible isotropization mechanisms. We argue that quadratic curvature corrections are able to isotropize fully anisotropic solutions whose scale factors describe accelerated expansion. Moreover, the degree of...

Source: http://arxiv.org/abs/gr-qc/9812021v1